关键词: 多功能采收机, 绿叶菜, 往复式切割器, 切割图, 响应面法

Abstract: The structure of the doubleacting reciprocating cutter intended for green leafy vegetable harvesting was designed, and the performance of the cutter was optimized based on the cutting diagram. By analyzing the effect of the single cutting area, the repeat cutting area and the uncut cutting area in the cutting diagram on cutting performance, it is concluded that the cutting performance of the cutter is best when the area of the uncut cutting area is 0 and the rate of the repeat cutting area is minimal, this is used as a basis for optimizing the design of the cutter. To address the problem that the existing methods of drawing and analyzing cutting diagrams do not combine high accuracy and simple operation, combining SolidWorks and Adams to draw cutting diagrams, and using ImagePro Plus software to identify and measure the relevant data in the cutting diagrams to quantitatively analyze and evaluate the cutting diagrams. In order to solve the problem that the existing cutting diagram evaluation index does not significantly reflect the change of cutting performance under the joint influence of dimensional and kinematic parameters of the cutter, it is proposed to use the distance indicating the uncut area and the rate of the repeat cutting area as evaluation indexes to reflect the changes of the three regions in the cutting diagram, and using these two evaluation indexes as target values, optimizing the cutting performance of the existing doubleacting reciprocating cutter. The study proposes to use this method of drawing, analyzing and evaluating cutting diagrams to further optimize cutting performance, analyzing the effect of the cutters size parameters (width of moving blade front end, height of moving blade cutting edge, blade spacing) and motion parameters (cutting speed index) on the distance indicating the uncut area and the rate of the repeat cutting area, using BoxBehnken central combinatorial experimental design to conduct a fourfactor and threelevel simulation test, the experimental results show that width of moving blade front end, height of moving blade cutting edge, blade spacing and cutting speed index have significant effects on the distance indicating the uncut area and the rate of the repeat cutting area. Parameter optimization results showed that  when width of moving blade front end was 5 mm, the height of moving blade cutting edge was 32 mm, the blade spacing was 30 mm, and the cutting speed index was 0.7, the area of the uncut cutting area was 0, the rate of the single cutting area was 88.26%, and the rate of the repeat cutting area was 11.74%. Compared with the results before optimization, the area of the uncut cutting area was still 0, but the rate of the single cutting area was increased by 6.18% and the rate of the repeat cutting area was reduced by 6.18%.

Key words: multifunctional harvester, green leafy vegetable, reciprocating cutter, cutting diagram, response surface method